Over 13,000 homes will have to be refurbished every week if the Government is going to reach its refurbishment target, according to the Energy Saving Trust.
The Government has set a target of seven million whole-house makeovers by 2020, which would consist of upgrading the basic insulation of a home and then adding other measures such as water efficiency measures, advanced insulation or micro-generation.
The Trust estimates that 6 million homes still need cavity wall insulation and half of all UK houses need more loft insulation.
These measures would save nearly 7 million tonnes of carbon dioxide a year, the organisation said.
The statistics have been released as the Energy Saving Trust prepares to launch its new Sustainable Refurbishment guide, which aims to assist the housing industry in taking a whole-house approach to upgrading the energy performance of existing homes.
The guide, it said, will show how to achieve an ambitious 80% reduction in carbon emissions from a range of different homes through applying home improvements that go beyond those required in current Building Regulations.
EST chief executive Philip Sellwood said: "With the Government's 2016 zero-carbon homes policy we have a clear trajectory to achieving very low-carbon new homes in England.
"We need a similar roadmap towards a low-carbon existing housing stock, setting out a set of standards we expect our homes to reach.
"An existing homes road map will give an incentive for homeowners to invest in home improvements and a clear signal to builders and installers to train staff to be able to deliver the energy and carbon saving measures."
Greengates Builders Merchants Accrington, Lancashire hopes that the government is able to reach their original targets for housing refurbishments.